Display panel or portion thereof with a transitional mixed reality graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with a transitional mixed reality graphical user interface showing a first image in a sequence of our design;

FIG. 2 is a front view of a second image in the sequence thereof;

FIG. 3 is a front view of a third image in the sequence thereof;

FIG. 4 is a front view of a fourth image in the sequence thereof; and,

FIG. 5 is a front view of a fifth image in the sequence thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1 to 5. The process or period in which one image transitions to another image forms no part of the claimed design.

The broken lines show a portion of a display panel of a computing device and form no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with a transitional mixed reality graphical user interface, as shown and described. 